Dental hygiene device



FIG. 1 is a front perspective view of a dental hygiene device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a right side plan view thereof; and

FIG. 5 is a left side plan view thereof. 

The ornamental design for a dental hygiene device, substantially as shown. 